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taxonomy.php
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<?php
/**
* Core Taxonomy API
*
* @package WordPress
* @subpackage Taxonomy
*/
//
// Taxonomy Registration
//
/**
* Creates the initial taxonomies.
*
* This function fires twice: in wp-settings.php before plugins are loaded (for
* backward compatibility reasons), and again on the {@see 'init'} action. We must
* avoid registering rewrite rules before the {@see 'init'} action.
*
* @since 2.8.0
*
* @global WP_Rewrite $wp_rewrite The WordPress rewrite class.
*/
function create_initial_taxonomies() {
global $wp_rewrite;
if ( ! did_action( 'init' ) ) {
$rewrite = array( 'category' => false, 'post_tag' => false, 'post_format' => false );
} else {
/**
* Filters the post formats rewrite base.
*
* @since 3.1.0
*
* @param string $context Context of the rewrite base. Default 'type'.
*/
$post_format_base = apply_filters( 'post_format_rewrite_base', 'type' );
$rewrite = array(
'category' => array(
'hierarchical' => true,
'slug' => get_option('category_base') ? get_option('category_base') : 'category',
'with_front' => ! get_option('category_base') || $wp_rewrite->using_index_permalinks(),
'ep_mask' => EP_CATEGORIES,
),
'post_tag' => array(
'hierarchical' => false,
'slug' => get_option('tag_base') ? get_option('tag_base') : 'tag',
'with_front' => ! get_option('tag_base') || $wp_rewrite->using_index_permalinks(),
'ep_mask' => EP_TAGS,
),
'post_format' => $post_format_base ? array( 'slug' => $post_format_base ) : false,
);
}
register_taxonomy( 'category', 'post', array(
'hierarchical' => true,
'query_var' => 'category_name',
'rewrite' => $rewrite['category'],
'public' => true,
'show_ui' => true,
'show_admin_column' => true,
'_builtin' => true,
'capabilities' => array(
'manage_terms' => 'manage_categories',
'edit_terms' => 'edit_categories',
'delete_terms' => 'delete_categories',
'assign_terms' => 'assign_categories',
),
'show_in_rest' => true,
'rest_base' => 'categories',
'rest_controller_class' => 'WP_REST_Terms_Controller',
) );
register_taxonomy( 'post_tag', 'post', array(
'hierarchical' => false,
'query_var' => 'tag',
'rewrite' => $rewrite['post_tag'],
'public' => true,
'show_ui' => true,
'show_admin_column' => true,
'_builtin' => true,
'capabilities' => array(
'manage_terms' => 'manage_post_tags',
'edit_terms' => 'edit_post_tags',
'delete_terms' => 'delete_post_tags',
'assign_terms' => 'assign_post_tags',
),
'show_in_rest' => true,
'rest_base' => 'tags',
'rest_controller_class' => 'WP_REST_Terms_Controller',
) );
register_taxonomy( 'nav_menu', 'nav_menu_item', array(
'public' => false,
'hierarchical' => false,
'labels' => array(
'name' => __( 'Navigation Menus' ),
'singular_name' => __( 'Navigation Menu' ),
),
'query_var' => false,
'rewrite' => false,
'show_ui' => false,
'_builtin' => true,
'show_in_nav_menus' => false,
) );
register_taxonomy( 'link_category', 'link', array(
'hierarchical' => false,
'labels' => array(
'name' => __( 'Link Categories' ),
'singular_name' => __( 'Link Category' ),
'search_items' => __( 'Search Link Categories' ),
'popular_items' => null,
'all_items' => __( 'All Link Categories' ),
'edit_item' => __( 'Edit Link Category' ),
'update_item' => __( 'Update Link Category' ),
'add_new_item' => __( 'Add New Link Category' ),
'new_item_name' => __( 'New Link Category Name' ),
'separate_items_with_commas' => null,
'add_or_remove_items' => null,
'choose_from_most_used' => null,
),
'capabilities' => array(
'manage_terms' => 'manage_links',
'edit_terms' => 'manage_links',
'delete_terms' => 'manage_links',
'assign_terms' => 'manage_links',
),
'query_var' => false,
'rewrite' => false,
'public' => false,
'show_ui' => true,
'_builtin' => true,
) );
register_taxonomy( 'post_format', 'post', array(
'public' => true,
'hierarchical' => false,
'labels' => array(
'name' => _x( 'Format', 'post format' ),
'singular_name' => _x( 'Format', 'post format' ),
),
'query_var' => true,
'rewrite' => $rewrite['post_format'],
'show_ui' => false,
'_builtin' => true,
'show_in_nav_menus' => current_theme_supports( 'post-formats' ),
) );
}
/**
* Retrieves a list of registered taxonomy names or objects.
*
* @since 3.0.0
*
* @global array $wp_taxonomies The registered taxonomies.
*
* @param array $args Optional. An array of `key => value` arguments to match against the taxonomy objects.
* Default empty array.
* @param string $output Optional. The type of output to return in the array. Accepts either taxonomy 'names'
* or 'objects'. Default 'names'.
* @param string $operator Optional. The logical operation to perform. Accepts 'and' or 'or'. 'or' means only
* one element from the array needs to match; 'and' means all elements must match.
* Default 'and'.
* @return array A list of taxonomy names or objects.
*/
function get_taxonomies( $args = array(), $output = 'names', $operator = 'and' ) {
global $wp_taxonomies;
$field = ('names' == $output) ? 'name' : false;
return wp_filter_object_list($wp_taxonomies, $args, $operator, $field);
}
/**
* Return the names or objects of the taxonomies which are registered for the requested object or object type, such as
* a post object or post type name.
*
* Example:
*
* $taxonomies = get_object_taxonomies( 'post' );
*
* This results in:
*
* Array( 'category', 'post_tag' )
*
* @since 2.3.0
*
* @global array $wp_taxonomies The registered taxonomies.
*
* @param array|string|WP_Post $object Name of the type of taxonomy object, or an object (row from posts)
* @param string $output Optional. The type of output to return in the array. Accepts either
* taxonomy 'names' or 'objects'. Default 'names'.
* @return array The names of all taxonomy of $object_type.
*/
function get_object_taxonomies( $object, $output = 'names' ) {
global $wp_taxonomies;
if ( is_object($object) ) {
if ( $object->post_type == 'attachment' )
return get_attachment_taxonomies( $object, $output );
$object = $object->post_type;
}
$object = (array) $object;
$taxonomies = array();
foreach ( (array) $wp_taxonomies as $tax_name => $tax_obj ) {
if ( array_intersect($object, (array) $tax_obj->object_type) ) {
if ( 'names' == $output )
$taxonomies[] = $tax_name;
else
$taxonomies[ $tax_name ] = $tax_obj;
}
}
return $taxonomies;
}
/**
* Retrieves the taxonomy object of $taxonomy.
*
* The get_taxonomy function will first check that the parameter string given
* is a taxonomy object and if it is, it will return it.
*
* @since 2.3.0
*
* @global array $wp_taxonomies The registered taxonomies.
*
* @param string $taxonomy Name of taxonomy object to return.
* @return WP_Taxonomy|false The Taxonomy Object or false if $taxonomy doesn't exist.
*/
function get_taxonomy( $taxonomy ) {
global $wp_taxonomies;
if ( ! taxonomy_exists( $taxonomy ) )
return false;
return $wp_taxonomies[$taxonomy];
}
/**
* Checks that the taxonomy name exists.
*
* Formerly is_taxonomy(), introduced in 2.3.0.
*
* @since 3.0.0
*
* @global array $wp_taxonomies The registered taxonomies.
*
* @param string $taxonomy Name of taxonomy object.
* @return bool Whether the taxonomy exists.
*/
function taxonomy_exists( $taxonomy ) {
global $wp_taxonomies;
return isset( $wp_taxonomies[$taxonomy] );
}
/**
* Whether the taxonomy object is hierarchical.
*
* Checks to make sure that the taxonomy is an object first. Then Gets the
* object, and finally returns the hierarchical value in the object.
*
* A false return value might also mean that the taxonomy does not exist.
*
* @since 2.3.0
*
* @param string $taxonomy Name of taxonomy object.
* @return bool Whether the taxonomy is hierarchical.
*/
function is_taxonomy_hierarchical($taxonomy) {
if ( ! taxonomy_exists($taxonomy) )
return false;
$taxonomy = get_taxonomy($taxonomy);
return $taxonomy->hierarchical;
}
/**
* Creates or modifies a taxonomy object.
*
* Note: Do not use before the {@see 'init'} hook.
*
* A simple function for creating or modifying a taxonomy object based on the
* parameters given. The function will accept an array (third optional
* parameter), along with strings for the taxonomy name and another string for
* the object type.
*
* @since 2.3.0
* @since 4.2.0 Introduced `show_in_quick_edit` argument.
* @since 4.4.0 The `show_ui` argument is now enforced on the term editing screen.
* @since 4.4.0 The `public` argument now controls whether the taxonomy can be queried on the front end.
* @since 4.5.0 Introduced `publicly_queryable` argument.
* @since 4.7.0 Introduced `show_in_rest`, 'rest_base' and 'rest_controller_class'
* arguments to register the Taxonomy in REST API.
*
* @global array $wp_taxonomies Registered taxonomies.
*
* @param string $taxonomy Taxonomy key, must not exceed 32 characters.
* @param array|string $object_type Object type or array of object types with which the taxonomy should be associated.
* @param array|string $args {
* Optional. Array or query string of arguments for registering a taxonomy.
*
* @type array $labels An array of labels for this taxonomy. By default, Tag labels are
* used for non-hierarchical taxonomies, and Category labels are used
* for hierarchical taxonomies. See accepted values in
* get_taxonomy_labels(). Default empty array.
* @type string $description A short descriptive summary of what the taxonomy is for. Default empty.
* @type bool $public Whether a taxonomy is intended for use publicly either via
* the admin interface or by front-end users. The default settings
* of `$publicly_queryable`, `$show_ui`, and `$show_in_nav_menus`
* are inherited from `$public`.
* @type bool $publicly_queryable Whether the taxonomy is publicly queryable.
* If not set, the default is inherited from `$public`
* @type bool $hierarchical Whether the taxonomy is hierarchical. Default false.
* @type bool $show_ui Whether to generate and allow a UI for managing terms in this taxonomy in
* the admin. If not set, the default is inherited from `$public`
* (default true).
* @type bool $show_in_menu Whether to show the taxonomy in the admin menu. If true, the taxonomy is
* shown as a submenu of the object type menu. If false, no menu is shown.
* `$show_ui` must be true. If not set, default is inherited from `$show_ui`
* (default true).
* @type bool $show_in_nav_menus Makes this taxonomy available for selection in navigation menus. If not
* set, the default is inherited from `$public` (default true).
* @type bool $show_in_rest Whether to include the taxonomy in the REST API.
* @type string $rest_base To change the base url of REST API route. Default is $taxonomy.
* @type string $rest_controller_class REST API Controller class name. Default is 'WP_REST_Terms_Controller'.
* @type bool $show_tagcloud Whether to list the taxonomy in the Tag Cloud Widget controls. If not set,
* the default is inherited from `$show_ui` (default true).
* @type bool $show_in_quick_edit Whether to show the taxonomy in the quick/bulk edit panel. It not set,
* the default is inherited from `$show_ui` (default true).
* @type bool $show_admin_column Whether to display a column for the taxonomy on its post type listing
* screens. Default false.
* @type bool|callable $meta_box_cb Provide a callback function for the meta box display. If not set,
* post_categories_meta_box() is used for hierarchical taxonomies, and
* post_tags_meta_box() is used for non-hierarchical. If false, no meta
* box is shown.
* @type array $capabilities {
* Array of capabilities for this taxonomy.
*
* @type string $manage_terms Default 'manage_categories'.
* @type string $edit_terms Default 'manage_categories'.
* @type string $delete_terms Default 'manage_categories'.
* @type string $assign_terms Default 'edit_posts'.
* }
* @type bool|array $rewrite {
* Triggers the handling of rewrites for this taxonomy. Default true, using $taxonomy as slug. To prevent
* rewrite, set to false. To specify rewrite rules, an array can be passed with any of these keys:
*
* @type string $slug Customize the permastruct slug. Default `$taxonomy` key.
* @type bool $with_front Should the permastruct be prepended with WP_Rewrite::$front. Default true.
* @type bool $hierarchical Either hierarchical rewrite tag or not. Default false.
* @type int $ep_mask Assign an endpoint mask. Default `EP_NONE`.
* }
* @type string $query_var Sets the query var key for this taxonomy. Default `$taxonomy` key. If
* false, a taxonomy cannot be loaded at `?{query_var}={term_slug}`. If a
* string, the query `?{query_var}={term_slug}` will be valid.
* @type callable $update_count_callback Works much like a hook, in that it will be called when the count is
* updated. Default _update_post_term_count() for taxonomies attached
* to post types, which confirms that the objects are published before
* counting them. Default _update_generic_term_count() for taxonomies
* attached to other object types, such as users.
* @type bool $_builtin This taxonomy is a "built-in" taxonomy. INTERNAL USE ONLY!
* Default false.
* }
* @return WP_Error|void WP_Error, if errors.
*/
function register_taxonomy( $taxonomy, $object_type, $args = array() ) {
global $wp_taxonomies;
if ( ! is_array( $wp_taxonomies ) )
$wp_taxonomies = array();
$args = wp_parse_args( $args );
if ( empty( $taxonomy ) || strlen( $taxonomy ) > 32 ) {
_doing_it_wrong( __FUNCTION__, __( 'Taxonomy names must be between 1 and 32 characters in length.' ), '4.2.0' );
return new WP_Error( 'taxonomy_length_invalid', __( 'Taxonomy names must be between 1 and 32 characters in length.' ) );
}
$taxonomy_object = new WP_Taxonomy( $taxonomy, $object_type, $args );
$taxonomy_object->add_rewrite_rules();
$wp_taxonomies[ $taxonomy ] = $taxonomy_object;
$taxonomy_object->add_hooks();
/**
* Fires after a taxonomy is registered.
*
* @since 3.3.0
*
* @param string $taxonomy Taxonomy slug.
* @param array|string $object_type Object type or array of object types.
* @param array $args Array of taxonomy registration arguments.
*/
do_action( 'registered_taxonomy', $taxonomy, $object_type, (array) $taxonomy_object );
}
/**
* Unregisters a taxonomy.
*
* Can not be used to unregister built-in taxonomies.
*
* @since 4.5.0
*
* @global WP $wp Current WordPress environment instance.
* @global array $wp_taxonomies List of taxonomies.
*
* @param string $taxonomy Taxonomy name.
* @return bool|WP_Error True on success, WP_Error on failure or if the taxonomy doesn't exist.
*/
function unregister_taxonomy( $taxonomy ) {
if ( ! taxonomy_exists( $taxonomy ) ) {
return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
}
$taxonomy_object = get_taxonomy( $taxonomy );
// Do not allow unregistering internal taxonomies.
if ( $taxonomy_object->_builtin ) {
return new WP_Error( 'invalid_taxonomy', __( 'Unregistering a built-in taxonomy is not allowed' ) );
}
global $wp_taxonomies;
$taxonomy_object->remove_rewrite_rules();
$taxonomy_object->remove_hooks();
// Remove the taxonomy.
unset( $wp_taxonomies[ $taxonomy ] );
/**
* Fires after a taxonomy is unregistered.
*
* @since 4.5.0
*
* @param string $taxonomy Taxonomy name.
*/
do_action( 'unregistered_taxonomy', $taxonomy );
return true;
}
/**
* Builds an object with all taxonomy labels out of a taxonomy object
*
* Accepted keys of the label array in the taxonomy object:
*
* - name - general name for the taxonomy, usually plural. The same as and overridden by $tax->label. Default is Tags/Categories
* - singular_name - name for one object of this taxonomy. Default is Tag/Category
* - search_items - Default is Search Tags/Search Categories
* - popular_items - This string isn't used on hierarchical taxonomies. Default is Popular Tags
* - all_items - Default is All Tags/All Categories
* - parent_item - This string isn't used on non-hierarchical taxonomies. In hierarchical ones the default is Parent Category
* - parent_item_colon - The same as `parent_item`, but with colon `:` in the end
* - edit_item - Default is Edit Tag/Edit Category
* - view_item - Default is View Tag/View Category
* - update_item - Default is Update Tag/Update Category
* - add_new_item - Default is Add New Tag/Add New Category
* - new_item_name - Default is New Tag Name/New Category Name
* - separate_items_with_commas - This string isn't used on hierarchical taxonomies. Default is "Separate tags with commas", used in the meta box.
* - add_or_remove_items - This string isn't used on hierarchical taxonomies. Default is "Add or remove tags", used in the meta box when JavaScript is disabled.
* - choose_from_most_used - This string isn't used on hierarchical taxonomies. Default is "Choose from the most used tags", used in the meta box.
* - not_found - Default is "No tags found"/"No categories found", used in the meta box and taxonomy list table.
* - no_terms - Default is "No tags"/"No categories", used in the posts and media list tables.
* - items_list_navigation - String for the table pagination hidden heading.
* - items_list - String for the table hidden heading.
*
* Above, the first default value is for non-hierarchical taxonomies (like tags) and the second one is for hierarchical taxonomies (like categories).
*
* @todo Better documentation for the labels array.
*
* @since 3.0.0
* @since 4.3.0 Added the `no_terms` label.
* @since 4.4.0 Added the `items_list_navigation` and `items_list` labels.
*
* @param WP_Taxonomy $tax Taxonomy object.
* @return object object with all the labels as member variables.
*/
function get_taxonomy_labels( $tax ) {
$tax->labels = (array) $tax->labels;
if ( isset( $tax->helps ) && empty( $tax->labels['separate_items_with_commas'] ) )
$tax->labels['separate_items_with_commas'] = $tax->helps;
if ( isset( $tax->no_tagcloud ) && empty( $tax->labels['not_found'] ) )
$tax->labels['not_found'] = $tax->no_tagcloud;
$nohier_vs_hier_defaults = array(
'name' => array( _x( 'Tags', 'taxonomy general name' ), _x( 'Categories', 'taxonomy general name' ) ),
'singular_name' => array( _x( 'Tag', 'taxonomy singular name' ), _x( 'Category', 'taxonomy singular name' ) ),
'search_items' => array( __( 'Search Tags' ), __( 'Search Categories' ) ),
'popular_items' => array( __( 'Popular Tags' ), null ),
'all_items' => array( __( 'All Tags' ), __( 'All Categories' ) ),
'parent_item' => array( null, __( 'Parent Category' ) ),
'parent_item_colon' => array( null, __( 'Parent Category:' ) ),
'edit_item' => array( __( 'Edit Tag' ), __( 'Edit Category' ) ),
'view_item' => array( __( 'View Tag' ), __( 'View Category' ) ),
'update_item' => array( __( 'Update Tag' ), __( 'Update Category' ) ),
'add_new_item' => array( __( 'Add New Tag' ), __( 'Add New Category' ) ),
'new_item_name' => array( __( 'New Tag Name' ), __( 'New Category Name' ) ),
'separate_items_with_commas' => array( __( 'Separate tags with commas' ), null ),
'add_or_remove_items' => array( __( 'Add or remove tags' ), null ),
'choose_from_most_used' => array( __( 'Choose from the most used tags' ), null ),
'not_found' => array( __( 'No tags found.' ), __( 'No categories found.' ) ),
'no_terms' => array( __( 'No tags' ), __( 'No categories' ) ),
'items_list_navigation' => array( __( 'Tags list navigation' ), __( 'Categories list navigation' ) ),
'items_list' => array( __( 'Tags list' ), __( 'Categories list' ) ),
);
$nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];
$labels = _get_custom_object_labels( $tax, $nohier_vs_hier_defaults );
$taxonomy = $tax->name;
$default_labels = clone $labels;
/**
* Filters the labels of a specific taxonomy.
*
* The dynamic portion of the hook name, `$taxonomy`, refers to the taxonomy slug.
*
* @since 4.4.0
*
* @see get_taxonomy_labels() for the full list of taxonomy labels.
*
* @param object $labels Object with labels for the taxonomy as member variables.
*/
$labels = apply_filters( "taxonomy_labels_{$taxonomy}", $labels );
// Ensure that the filtered labels contain all required default values.
$labels = (object) array_merge( (array) $default_labels, (array) $labels );
return $labels;
}
/**
* Add an already registered taxonomy to an object type.
*
* @since 3.0.0
*
* @global array $wp_taxonomies The registered taxonomies.
*
* @param string $taxonomy Name of taxonomy object.
* @param string $object_type Name of the object type.
* @return bool True if successful, false if not.
*/
function register_taxonomy_for_object_type( $taxonomy, $object_type) {
global $wp_taxonomies;
if ( !isset($wp_taxonomies[$taxonomy]) )
return false;
if ( ! get_post_type_object($object_type) )
return false;
if ( ! in_array( $object_type, $wp_taxonomies[$taxonomy]->object_type ) )
$wp_taxonomies[$taxonomy]->object_type[] = $object_type;
// Filter out empties.
$wp_taxonomies[ $taxonomy ]->object_type = array_filter( $wp_taxonomies[ $taxonomy ]->object_type );
return true;
}
/**
* Remove an already registered taxonomy from an object type.
*
* @since 3.7.0
*
* @global array $wp_taxonomies The registered taxonomies.
*
* @param string $taxonomy Name of taxonomy object.
* @param string $object_type Name of the object type.
* @return bool True if successful, false if not.
*/
function unregister_taxonomy_for_object_type( $taxonomy, $object_type ) {
global $wp_taxonomies;
if ( ! isset( $wp_taxonomies[ $taxonomy ] ) )
return false;
if ( ! get_post_type_object( $object_type ) )
return false;
$key = array_search( $object_type, $wp_taxonomies[ $taxonomy ]->object_type, true );
if ( false === $key )
return false;
unset( $wp_taxonomies[ $taxonomy ]->object_type[ $key ] );
return true;
}
//
// Term API
//
/**
* Retrieve object_ids of valid taxonomy and term.
*
* The strings of $taxonomies must exist before this function will continue. On
* failure of finding a valid taxonomy, it will return an WP_Error class, kind
* of like Exceptions in PHP 5, except you can't catch them. Even so, you can
* still test for the WP_Error class and get the error message.
*
* The $terms aren't checked the same as $taxonomies, but still need to exist
* for $object_ids to be returned.
*
* It is possible to change the order that object_ids is returned by either
* using PHP sort family functions or using the database by using $args with
* either ASC or DESC array. The value should be in the key named 'order'.
*
* @since 2.3.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param int|array $term_ids Term id or array of term ids of terms that will be used.
* @param string|array $taxonomies String of taxonomy name or Array of string values of taxonomy names.
* @param array|string $args Change the order of the object_ids, either ASC or DESC.
* @return WP_Error|array If the taxonomy does not exist, then WP_Error will be returned. On success.
* the array can be empty meaning that there are no $object_ids found or it will return the $object_ids found.
*/
function get_objects_in_term( $term_ids, $taxonomies, $args = array() ) {
global $wpdb;
if ( ! is_array( $term_ids ) ) {
$term_ids = array( $term_ids );
}
if ( ! is_array( $taxonomies ) ) {
$taxonomies = array( $taxonomies );
}
foreach ( (array) $taxonomies as $taxonomy ) {
if ( ! taxonomy_exists( $taxonomy ) ) {
return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
}
}
$defaults = array( 'order' => 'ASC' );
$args = wp_parse_args( $args, $defaults );
$order = ( 'desc' == strtolower( $args['order'] ) ) ? 'DESC' : 'ASC';
$term_ids = array_map('intval', $term_ids );
$taxonomies = "'" . implode( "', '", array_map( 'esc_sql', $taxonomies ) ) . "'";
$term_ids = "'" . implode( "', '", $term_ids ) . "'";
$object_ids = $wpdb->get_col("SELECT tr.object_id FROM $wpdb->term_relationships AS tr INNER JOIN $wpdb->term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ($taxonomies) AND tt.term_id IN ($term_ids) ORDER BY tr.object_id $order");
if ( ! $object_ids ){
return array();
}
return $object_ids;
}
/**
* Given a taxonomy query, generates SQL to be appended to a main query.
*
* @since 3.1.0
*
* @see WP_Tax_Query
*
* @param array $tax_query A compact tax query
* @param string $primary_table
* @param string $primary_id_column
* @return array
*/
function get_tax_sql( $tax_query, $primary_table, $primary_id_column ) {
$tax_query_obj = new WP_Tax_Query( $tax_query );
return $tax_query_obj->get_sql( $primary_table, $primary_id_column );
}
/**
* Get all Term data from database by Term ID.
*
* The usage of the get_term function is to apply filters to a term object. It
* is possible to get a term object from the database before applying the
* filters.
*
* $term ID must be part of $taxonomy, to get from the database. Failure, might
* be able to be captured by the hooks. Failure would be the same value as $wpdb
* returns for the get_row method.
*
* There are two hooks, one is specifically for each term, named 'get_term', and
* the second is for the taxonomy name, 'term_$taxonomy'. Both hooks gets the
* term object, and the taxonomy name as parameters. Both hooks are expected to
* return a Term object.
*
* {@see 'get_term'} hook - Takes two parameters the term Object and the taxonomy name.
* Must return term object. Used in get_term() as a catch-all filter for every
* $term.
*
* {@see 'get_$taxonomy'} hook - Takes two parameters the term Object and the taxonomy
* name. Must return term object. $taxonomy will be the taxonomy name, so for
* example, if 'category', it would be 'get_category' as the filter name. Useful
* for custom taxonomies or plugging into default taxonomies.
*
* @todo Better formatting for DocBlock
*
* @since 2.3.0
* @since 4.4.0 Converted to return a WP_Term object if `$output` is `OBJECT`.
* The `$taxonomy` parameter was made optional.
*
* @global wpdb $wpdb WordPress database abstraction object.
* @see sanitize_term_field() The $context param lists the available values for get_term_by() $filter param.
*
* @param int|WP_Term|object $term If integer, term data will be fetched from the database, or from the cache if
* available. If stdClass object (as in the results of a database query), will apply
* filters and return a `WP_Term` object corresponding to the `$term` data. If `WP_Term`,
* will return `$term`.
* @param string $taxonomy Optional. Taxonomy name that $term is part of.
* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
* a WP_Term object, an associative array, or a numeric array, respectively. Default OBJECT.
* @param string $filter Optional, default is raw or no WordPress defined filter will applied.
* @return array|WP_Term|WP_Error|null Object of the type specified by `$output` on success. When `$output` is 'OBJECT',
* a WP_Term instance is returned. If taxonomy does not exist, a WP_Error is
* returned. Returns null for miscellaneous failure.
*/
function get_term( $term, $taxonomy = '', $output = OBJECT, $filter = 'raw' ) {
if ( empty( $term ) ) {
return new WP_Error( 'invalid_term', __( 'Empty Term' ) );
}
if ( $taxonomy && ! taxonomy_exists( $taxonomy ) ) {
return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
}
if ( $term instanceof WP_Term ) {
$_term = $term;
} elseif ( is_object( $term ) ) {
if ( empty( $term->filter ) || 'raw' === $term->filter ) {
$_term = sanitize_term( $term, $taxonomy, 'raw' );
$_term = new WP_Term( $_term );
} else {
$_term = WP_Term::get_instance( $term->term_id );
}
} else {
$_term = WP_Term::get_instance( $term, $taxonomy );
}
if ( is_wp_error( $_term ) ) {
return $_term;
} elseif ( ! $_term ) {
return null;
}
/**
* Filters a term.
*
* @since 2.3.0
* @since 4.4.0 `$_term` can now also be a WP_Term object.
*
* @param int|WP_Term $_term Term object or ID.
* @param string $taxonomy The taxonomy slug.
*/
$_term = apply_filters( 'get_term', $_term, $taxonomy );
/**
* Filters a taxonomy.
*
* The dynamic portion of the filter name, `$taxonomy`, refers
* to the taxonomy slug.
*
* @since 2.3.0
* @since 4.4.0 `$_term` can now also be a WP_Term object.
*
* @param int|WP_Term $_term Term object or ID.
* @param string $taxonomy The taxonomy slug.
*/
$_term = apply_filters( "get_{$taxonomy}", $_term, $taxonomy );
// Bail if a filter callback has changed the type of the `$_term` object.
if ( ! ( $_term instanceof WP_Term ) ) {
return $_term;
}
// Sanitize term, according to the specified filter.
$_term->filter( $filter );
if ( $output == ARRAY_A ) {
return $_term->to_array();
} elseif ( $output == ARRAY_N ) {
return array_values( $_term->to_array() );
}
return $_term;
}
/**
* Get all Term data from database by Term field and data.
*
* Warning: $value is not escaped for 'name' $field. You must do it yourself, if
* required.
*
* The default $field is 'id', therefore it is possible to also use null for
* field, but not recommended that you do so.
*
* If $value does not exist, the return value will be false. If $taxonomy exists
* and $field and $value combinations exist, the Term will be returned.
*
* This function will always return the first term that matches the `$field`-
* `$value`-`$taxonomy` combination specified in the parameters. If your query
* is likely to match more than one term (as is likely to be the case when
* `$field` is 'name', for example), consider using get_terms() instead; that
* way, you will get all matching terms, and can provide your own logic for
* deciding which one was intended.
*
* @todo Better formatting for DocBlock.
*
* @since 2.3.0
* @since 4.4.0 `$taxonomy` is optional if `$field` is 'term_taxonomy_id'. Converted to return
* a WP_Term object if `$output` is `OBJECT`.
*
* @global wpdb $wpdb WordPress database abstraction object.
* @see sanitize_term_field() The $context param lists the available values for get_term_by() $filter param.
*
* @param string $field Either 'slug', 'name', 'id' (term_id), or 'term_taxonomy_id'
* @param string|int $value Search for this term value
* @param string $taxonomy Taxonomy name. Optional, if `$field` is 'term_taxonomy_id'.
* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
* a WP_Term object, an associative array, or a numeric array, respectively. Default OBJECT.
* @param string $filter Optional, default is raw or no WordPress defined filter will applied.
* @return WP_Term|array|false WP_Term instance (or array) on success. Will return false if `$taxonomy` does not exist
* or `$term` was not found.
*/
function get_term_by( $field, $value, $taxonomy = '', $output = OBJECT, $filter = 'raw' ) {
// 'term_taxonomy_id' lookups don't require taxonomy checks.
if ( 'term_taxonomy_id' !== $field && ! taxonomy_exists( $taxonomy ) ) {
return false;
}
// No need to perform a query for empty 'slug' or 'name'.
if ( 'slug' === $field || 'name' === $field ) {
$value = (string) $value;
if ( 0 === strlen( $value ) ) {
return false;
}
}
if ( 'id' === $field || 'term_id' === $field ) {
$term = get_term( (int) $value, $taxonomy, $output, $filter );
if ( is_wp_error( $term ) || null === $term ) {
$term = false;
}
return $term;
}
$args = array(
'get' => 'all',
'number' => 1,
'taxonomy' => $taxonomy,
'update_term_meta_cache' => false,
'orderby' => 'none',
'suppress_filter' => true,
);
switch ( $field ) {
case 'slug' :
$args['slug'] = $value;
break;
case 'name' :
$args['name'] = $value;
break;
case 'term_taxonomy_id' :
$args['term_taxonomy_id'] = $value;
unset( $args[ 'taxonomy' ] );
break;
default :
return false;
}
$terms = get_terms( $args );
if ( is_wp_error( $terms ) || empty( $terms ) ) {
return false;
}
$term = array_shift( $terms );
// In the case of 'term_taxonomy_id', override the provided `$taxonomy` with whatever we find in the db.
if ( 'term_taxonomy_id' === $field ) {
$taxonomy = $term->taxonomy;
}
return get_term( $term, $taxonomy, $output, $filter );
}
/**
* Merge all term children into a single array of their IDs.
*
* This recursive function will merge all of the children of $term into the same
* array of term IDs. Only useful for taxonomies which are hierarchical.
*
* Will return an empty array if $term does not exist in $taxonomy.
*
* @since 2.3.0
*
* @param string $term_id ID of Term to get children.
* @param string $taxonomy Taxonomy Name.
* @return array|WP_Error List of Term IDs. WP_Error returned if `$taxonomy` does not exist.
*/
function get_term_children( $term_id, $taxonomy ) {
if ( ! taxonomy_exists( $taxonomy ) ) {
return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
}
$term_id = intval( $term_id );
$terms = _get_term_hierarchy($taxonomy);
if ( ! isset($terms[$term_id]) )
return array();
$children = $terms[$term_id];
foreach ( (array) $terms[$term_id] as $child ) {
if ( $term_id == $child ) {
continue;
}
if ( isset($terms[$child]) )
$children = array_merge($children, get_term_children($child, $taxonomy));
}
return $children;
}
/**
* Get sanitized Term field.
*
* The function is for contextual reasons and for simplicity of usage.
*
* @since 2.3.0
* @since 4.4.0 The `$taxonomy` parameter was made optional. `$term` can also now accept a WP_Term object.
*
* @see sanitize_term_field()
*
* @param string $field Term field to fetch.
* @param int|WP_Term $term Term ID or object.
* @param string $taxonomy Optional. Taxonomy Name. Default empty.
* @param string $context Optional, default is display. Look at sanitize_term_field() for available options.
* @return string|int|null|WP_Error Will return an empty string if $term is not an object or if $field is not set in $term.
*/
function get_term_field( $field, $term, $taxonomy = '', $context = 'display' ) {
$term = get_term( $term, $taxonomy );
if ( is_wp_error($term) )
return $term;
if ( !is_object($term) )
return '';
if ( !isset($term->$field) )
return '';
return sanitize_term_field( $field, $term->$field, $term->term_id, $term->taxonomy, $context );
}
/**
* Sanitizes Term for editing.
*
* Return value is sanitize_term() and usage is for sanitizing the term for
* editing. Function is for contextual and simplicity.
*
* @since 2.3.0
*
* @param int|object $id Term ID or object.
* @param string $taxonomy Taxonomy name.
* @return string|int|null|WP_Error Will return empty string if $term is not an object.
*/
function get_term_to_edit( $id, $taxonomy ) {
$term = get_term( $id, $taxonomy );
if ( is_wp_error($term) )
return $term;
if ( !is_object($term) )
return '';
return sanitize_term($term, $taxonomy, 'edit');
}
/**
* Retrieve the terms in a given taxonomy or list of taxonomies.
*
* You can fully inject any customizations to the query before it is sent, as
* well as control the output with a filter.
*
* The {@see 'get_terms'} filter will be called when the cache has the term and will
* pass the found term along with the array of $taxonomies and array of $args.
* This filter is also called before the array of terms is passed and will pass
* the array of terms, along with the $taxonomies and $args.
*
* The {@see 'list_terms_exclusions'} filter passes the compiled exclusions along with
* the $args.